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Cheap flights from St. Louis to Sofia from $537

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Sofia departing on 2/20. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from St. Louis to Sofia

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
10:14 am - 1:55 pm
STL
-
SOF
19h 41m2 stops
Multiple Airlines Logo
7:00 am - 11:36 pm
SOF
-
STL
24h 36m2 stops
$537Multiple Airlines
Fri, Feb 20 - Fri, Feb 27
British Airways Logo
3:37 pm - 11:15 am
STL
-
SOF
35h 38m2 stops
British Airways Logo
5:25 pm - 8:13 pm
SOF
-
STL
34h 48m2 stops
$658British Airways
Thu, Jan 29 - Mon, Feb 2
United Airlines Logo
8:05 am - 10:45 pm
STL
-
SOF
30h 40m2 stops
United Airlines Logo
6:10 am - 10:00 pm
SOF
-
STL
23h 50m2 stops
$747United Airlines
Thu, Jan 29 - Mon, Feb 2
United Airlines Logo
8:05 am - 10:45 pm
STL
-
SOF
30h 40m2 stops
United Airlines Logo
1:45 pm - 11:59 pm
SOF
-
STL
18h 14m2 stops
$748United Airlines
Thu, Jan 29 - Mon, Feb 2
Multiple Airlines Logo
12:10 pm - 11:00 am
STL
-
SOF
14h 50m2 stops
Multiple Airlines Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m1 stop
$796Multiple Airlines
Sun, Jul 5 - Wed, Jul 15
Lufthansa Logo
3:30 pm - 6:10 pm
STL
-
SOF
18h 40m1 stop
Lufthansa Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m1 stop
$814Lufthansa
Sun, Jul 5 - Wed, Jul 15
Multiple Airlines Logo
12:10 pm - 11:00 am
STL
-
SOF
14h 50m2 stops
Multiple Airlines Logo
6:10 am - 1:25 pm
SOF
-
STL
15h 15m2 stops
$821Multiple Airlines
Sun, Jul 5 - Wed, Jul 15
Multiple Airlines Logo
4:05 pm - 10:45 pm
STL
-
SOF
22h 40m2 stops
Multiple Airlines Logo
6:10 am - 5:45 pm
SOF
-
STL
19h 35m3 stops
$843Multiple Airlines
Fri, Feb 20 - Fri, Feb 27
Multiple Airlines Logo
4:05 pm - 10:45 pm
STL
-
SOF
23h 40m2 stops
Multiple Airlines Logo
6:10 am - 3:29 pm
SOF
-
STL
40h 19m2 stops
$1,118Multiple Airlines
Fri, Mar 13 - Fri, Mar 20
Air Canada Logo
9:55 am - 1:35 pm
STL
-
SOF
19h 40m3 stops
Air Canada Logo
6:10 am - 5:45 pm
SOF
-
STL
19h 35m3 stops
$1,282Air Canada
Fri, Feb 20 - Fri, Feb 27

Air Canada flights from St. Louis to Sofia

Our best Air Canada deals on St. Louis to Sofia flight tickets
Air Canada
Feb 20
STL9:55 amLambert-St Louis
19h 40m
3 stops
SOF1:35 pmSofia
Feb 27
SOF6:10 amSofia
19h 35m
3 stops
STL5:45 pmLambert-St Louis
$1,282
Find similar
Air Canada
Mar 13
STL11:25 amLambert-St Louis
19h 10m
3 stops
SOF1:35 pmSofia
Mar 20
SOF6:10 amSofia
21h 57m
3 stops
STL9:07 pmLambert-St Louis
$3,163
Find similar

United Airlines flights from St. Louis to Sofia

Our best United Airlines deals on St. Louis to Sofia flight tickets
United Airlines
Jan 29
STL8:05 amLambert-St Louis
30h 40m
2 stops
SOF10:45 pmSofia
Feb 2
SOF6:10 amSofia
23h 50m
2 stops
STL10:00 pmLambert-St Louis
$747
Find similar
United Airlines
Jan 29
STL8:05 amLambert-St Louis
30h 40m
2 stops
SOF10:45 pmSofia
Feb 2
SOF1:45 pmSofia
18h 14m
2 stops
STL11:59 pmLambert-St Louis
$748
Find similar
United Airlines
Mar 13
STL4:05 pmLambert-St Louis
23h 40m
2 stops
SOF10:45 pmSofia
Mar 20
SOF6:10 amSofia
15h 45m
1 stop
STL2:55 pmLambert-St Louis
$1,382
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Sofia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated January 6, 2026.
Use the filters below to find and compare flights from St. Louis to Sofia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 2/20

10:14 am-1:55 pm

2 stops19h 41m

Sofia

Fri 2/27

7:00 am-11:36 pm

2 stops24h 36m

$537

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Thu 1/29

3:37 pm-11:15 am

2 stops35h 38m

Sofia

Mon 2/2

5:25 pm-8:13 pm

2 stops34h 48m

$658

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Thu 1/29

8:05 am-10:45 pm

2 stops30h 40m

Sofia

Mon 2/2

6:10 am-10:00 pm

2 stops23h 50m

$747

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Thu 1/29

8:05 am-10:45 pm

2 stops30h 40m

Sofia

Mon 2/2

1:45 pm-11:59 pm

2 stops18h 14m

$748

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 7/5

12:10 pm-11:00 am

2 stops14h 50m

Sofia

Wed 7/15

6:20 am-1:25 pm

1 stop15h 05m

$796

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 7/5

3:30 pm-6:10 pm

1 stop18h 40m

Sofia

Wed 7/15

6:20 am-1:25 pm

1 stop15h 05m

$814

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 7/5

12:10 pm-11:00 am

2 stops14h 50m

Sofia

Wed 7/15

6:10 am-1:25 pm

2 stops15h 15m

$821

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 2/20

4:05 pm-10:45 pm

2 stops22h 40m

Sofia

Fri 2/27

6:10 am-5:45 pm

3 stops19h 35m

$843

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 3/13

4:05 pm-10:45 pm

2 stops23h 40m

Sofia

Fri 3/20

6:10 am-3:29 pm

2 stops40h 19m

$1,118

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 2/20

9:55 am-1:35 pm

3 stops19h 40m

Sofia

Fri 2/27

6:10 am-5:45 pm

3 stops19h 35m

$1,282

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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How to get the cheapest flight ticket from St. Louis to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

How far in advance should I book a flight to Sofia?

You are more likely to see cheaper flights to Sofia from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Sofia for around $888 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sofia from St. Louis for as low as $791 on momondo.

Can stopping save me money on St. Louis to Sofia flights?

You could potentially save up to 17% on your flight if you consider stops on a St. Louis to Sofia flight.

When to book flights from St. Louis to Sofia

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Sofia according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Sofia (STL to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Sofia

Fastest flight time

15h 36m

Direct flights

None
The fastest flight from St. Louis to Sofia takes 15h 36m
There are no direct flights from St. Louis to Sofia. There are no popular flight routes from St. Louis to Sofia.
Search flight deals

  • How far is Lambert-St Louis to Sofia by plane?

    A flight from Lambert-St Louis to Sofia will travel around 5441.0 mi. 15h 36m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Sofia Airport?

    Prices for flights from Lambert-St Louis Airport to Sofia Airport are updated daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Sofia Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Sofia Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Sofia Airport.

  • What documentation or ID do you need to fly to Sofia Airport?

    The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from St. Louis to Sofia?

Best airlines flying from St. Louis to Sofia

Compare and see reviews for airlines that fly from St. Louis to Sofia with momondo
Airline
Rating
Free Cancellation
Price
LufthansaPriceFrom $645Free CancellationRating
6.8
7,683 reviews
Search Lufthansa flights
United AirlinesPriceFrom $721Free CancellationRating
7.4
9,132 reviews
Search United Airlines flights

Traveling to a place near Sofia?

Book flights to Sofia if you plan to visit one of these locations
Bansko
Borovets
Velingrad
Sandanski

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Sofia?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Sofia. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Sofia with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Sofia from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Sofia?

Once all potential St. Louis to Sofia flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Sofia right now. Can momondo alert me if prices change?

Price alerts on flights to Sofia from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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